Ответы на вопрос:
Cos6π/5*sin3π/10-sin6π/5*sin(-4π/5)=cos(π+π/5)sin(π/2-π/5)-sin(π+π/5)sin(π+π/5)= =-cosπ/5cosπ/5-sinπ/5sinπ/5=-(cos²π/5+sin²π/5)=-1
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